theyusedwinpower theyusedwinpower
people invented it
they used either the rain or chalk erasers because they only had chalk.
The abacus was invented to help people calculate.
it was invented by lots of people so over a long time
no one actaly invented drawing acent people drew on cave walls but realy no one invented drawing
People can generate electricity from water through hydropower, which involves using water flow to turn turbines connected to generators. When the turbines spin, they drive the generators to produce electricity. Hydropower is a renewable and environmentally friendly source of energy that can be produced on a large scale in hydroelectric power plants or on a smaller scale in micro-hydro systems.
the answer to your question is that OVER 9000! people work in a hydroelectric powerplant.
Wind generators are a good source of energy as wind is free. But there are many questions you have to consider before installing a wind generation and especially for what purpose.
Crawling
Buttons.
bikes
benches
pickaxes
Hydroelectric power produces almost no waste.
Shoelaces were invented long before people bothered to keep records of such things.
Before the refrigerator was invented, people used iceboxes, which were essentially big coolers with a block of ice. Even before that, food was preserved by salting, curing, smoking, drying, and canning.
Brief case